Extrusion press



U. NISSEN EXTRUSION PRESS Jan. 8, 1946.

2 Sheets-Sheet 1 Filed June 25, 1940 U. NISSEN EXTRUS ION PRESS Jan. s, 1946.

Filed June 25, 1940 2 Sheets-Sheet 2 i INVENTOR. (//lgLc/i fassen HTTORNE Y- Patented Jen. 8, 1946 EXTRUSION PRESS Ulrich Nissen, Berlin-Hennsdorf, Germany; vested in the Alien Property Custodian Application June 25, 1940, Serial No. 342,401

8 Claims.

This invention relates to presses and more particularly to so-called extrusion presses serving for the production of work-pieces having a profile tapering in the longitudinal direction of pressing.

It is known to produce work-pieces having a profile conically tapering in longitudinal direction by means of presses of the aforementioned kind including conical mandrils that are connected with the press-plunger, said mandrils moving during the operation of pressing through a, fixed die of uniform cross-section. Although with known presses of this kind there may be produced work-piecesl having angular profiles with the parts thereof varying both in thickness as well as in length, it is not possible to make work pieces of a T, I, U- or similar profile of varying length in addition to varying thickness of the web and of the flanges.

My invention, now, has for its general object to devise a press to produce work-pieces having profiles varying to a far greater extent than had been possible to produce with known presses.

According to my invention I propose to equip the press with a two-part die and to provide guide means for the two halves of said die on the exterior surfaces thereof, said guide means being of the form of a holder or support taper- Germany November 3, 1938 ing in the direction of pressing, while the distance between the two halves of the die is defined by the aforesaid conical mandrils that are connected with the press-plunger, said mandrils tapering in direction towards the latter, in order to properly guide the two halves of the die. By this the two halves of the die will gradually approach each other during the operation of pressing and simultaneously move in said holder or support in direction of the operation of pressing in accordance with the approaching of said two halves of the die'. In addition to the tapering guides for the two halves of the die, the said mandrils are further provided with recesses tapering in direction towards the press-plunger to produce the aforesaid conlcally tapering profiles. Moreover, these recesses in the mandrils may be tapering towards the press-plunger both in direction of their height as well as in direction of their width.

According to my invention, furthermore, there may be provided bridge-like members guided in front of the two halves of the die and bridging the gap between these in order to subdivide the tapering profiles of the work-piece to be made by thev press.

In the accompanying drawings I have represented an example of a press constructed in accordance with my present invention. In the fifi drawings, Fig. l is a vertical longitudinal section through my new press in condition shortly after the beginning of the operation of pressing, Fig. 2 a horizontal longitudinal section of the press represented in Fig. 1 without the work-piece, Fig. 3 a view of the press shown in Figs. 1 and 2, as seen in direction opposite to the operation of pressing, Fig. 4 a section along line IV-IV of Fig. 2, Fig. 5 a horizontal longitudinal section of the press shown in Fig. 2 without the work-piece in condition shortly before completion of pressing,.Fig. 6 a view of a press constructed in accordance with Fig. 3 for the production of U-shaped workpieces having a tapering profile, Fig. 7 is a perspective View with parts broken away depicting the interior arrangement of the press of Figs. 1-5. Fig, 8 is a perspective view of a T-profile such as produced in pairs by the press shown in Figs. 1-5 and Fig. 7, and Fig. 9 is a perspective view of a U-prole such as produced in pairs by the press shown in Fig. 6.

Refer. ing more particularly to the drawings. the receptacle of the press is designated by the reference numeral I, the press-plunger by the numeral 2, the press-mandrils connected with the press-plunger by the numerals 3 and 4 and the two halves of the die by the numerals 5 and 6. The two halves of the die are exteriorly guided by means of a conical holder or support 1, while the distance between said halves of the die is defined by guide-ribs 8 provided on the mandrils 3 and 4. As may be seen from Fig. 2, the guide surfaces of the ribs 8 for the two halves of the die taper in the direction towards the pressplunger, so that during the operation of pressingr the distance between the two halves 5 land 6 0f the die will be diminished, which is due to 'the fact that by action of the operating pressure the two halves of the die will be displaced in direction of pressing in the conical guide surface of the member 1, until they abut against the guide surfaces of the ribs 8. In this manner the thickness of the web of the profile defined by the distance between the two halves of the die will be of progressively and uniformly tapering conformation. The mandrils 3 and 4 are further provided with recesses 9 `which are likewise tapering towards the press-plunger in direction of their height as well as in direction of their depth, as indicated in the drawings. In the construction shown in the drawings, the two flanges of the I- or the two T-proles will be defined by said recesses 9. The produced profile may conveniently be subdivided by means of the bridge-like members bridging the gap between the two halves Cil andFig. 7. As-.herein shown, kthe portion 2BA is uniform in thicknesses of both web and flange, the portion 20B is tapering in thicknesses of web and ange and the portion 20C is uniform in thicknesses of web and ange, but with the thick? ness of each less than that of the corresponding web or flange oi.' portion 20A.

As a matter of course, my new press may also be used for the production of profiles other than those mentioned, for instance for the production of U protlles. A construction of the press modiiled for this purpose is shown in Fig. 6 in accordance with Fig. 3 for the production of' two U- profiles tapering in longitudinal direction. In this case II and l2 represent the two halves of the die, I3 is the mandril connected with the press-plunger, M are the guide-ribs for the two halves of the die and I5 the recesses in the mandril I3, said recesses I5 dening the ,dimensions I A sample U-prole is shown in Fig. 9 as exemplary of the product of the press shown in'Fig. 6. As shown, the portion 30A is uniform in thicknesses of web and flanges, the portion 30C is also uniform in thicknesses of web and flanges, but with the thicknesses of each reduced with respect to the corresponding members in 30A. Between the two end portions the portion 30B is illustrated as having both ilanges and web tapering in thicknesses. Obviously, the entire product of the press could be tapering, if desired. Fig. 9 is illustrative of the possibilities of the present invention.

I claim:

1. A press for making work-pieces tapering in the longitudinal direction of pressing, especially of T, I- and U-shaped profiles, comprising a press-plunger, a vtwo-pari', die, a guide having surface means slidably supporting said die, said surface means being tapered in the direction of the operating pressure of the press, and mandrils on the working face of said press-plunger, said mandrils being slidably supported in said guide and being tapered towards said press-plunger, whereby when the work is pressed through the die, to drive the two halves thereof towards one another to taper the work-piece in one dimension, and sii multaneously, to taper the work-piece in another dimension as the mandrel slides through said guide.

2. A press as claimed in claim 1, said mandrils having tapering guides slidably engaging the two halves of the die, and recess means tapering in direction towards the press-plunger, whereby to ,mensionstowards the press-plunger whereby to produce conically tapering surfaces on theproille of the Work-piece.

4. A press as claimed in claim l, said mandrils having tapering guides slidably engaging the two halves of the die and recess means tapering in direction towards the press-plunger, whereby to produce conically tapering surfaces on the prole of a work-piece, and bridge-like members provided in front of the two halves of the die, with respect to the direction of the operating pressure of the press. said bridge-like members being guided in said two halves of the die and bridging the gap between said two halves for subdividing the proiile of the work-piece to be made by the press.

5. A press as claimed in claim 1, said mandrils having tapering guides slidably engaging the two halves of the die and recesses tapering'in two transverse dimensions, whereby to produce conically tapering surfaces on the profile of the workpiece, and bridge-like members in front of the two halves o1' the die, with respect to the direction of the operating pressure of the press, said bridge-like members being guided in said two halves of said die and bridging'the gap between said two halves for the purpose of subdividing the profile of the work-piece to be made by the press.

6. A press as claimed in claim 1, and bridgelike members in front of the two halves of the die, with respect to 'direction of the operating pressure of the press, said bridge-like members being guided in said two halves of said die for the purpose of subdividing the prole of the workpiece to be made by the press.

'7. A press as claimed in claim l, said mandrils having recesses tapering in direction towards the press-plunger, and tapering guides for the two halves of the die, and bridge-like members provided in front of the two halves of the die with respect to the direction of the operating pressure of 'the press, said bridge-like members being guided in said two halves of said die and bridging the gap between said two halves for the purpose of subdividing the profile of the work-piece to be made by the press.

8. A press as claimed in claim 1. said mandrlls having tapering in two transverse dimensions towards the press-plunger, said press further including conically tapering guides for the two halves of the die, and bridge-like members in front of the two halves of the die with respect to the direction of the operating pressure of the press, said bridge-like members being guided in said two halves whereby subdividing the prole of the work-piece to be made by the press.

ULRICH NISSEN. 

